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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431a30d6c0276a66b1ac5b0ddc78a478dee97dbb535f4de296dd7b5a5c21c130' 
  AND token = 'cL5LuToxJN2fbE8cv5D7kns0W05fQ5dTZVqFw0lNw4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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