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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f99766e5aa51e187c275136aed0af5ca52d93b024c4cbf356671876fa1495ac' 
  AND token = 'fj0Zc0njpyQhhpaUZUki9KG9LPTWjbQgOg0xqH24fzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}