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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936c0a9379a3627aa5ddff007207b4f24a5112c64c442bb0a3b4af34d24bce6a' 
  AND token = 'HrXvtS247lhxwY3BB8C2z1AQh9lCARAQ68pCMt5QttY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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