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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c56abc56b8d4d4b669d4faed907e9a6746d3bacf5530864c0059ddc8c1cddb' 
  AND token = 'zqoQuhZcuY9htJfV9VTM6vxyokal6PziyxnD2DUxVVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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