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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77960b7d4cf100e8de74417a76bd454ec2f9cf861ebcc7c2498c8e1c42dddae9' 
  AND token = 'nrI2EMJDZUm6zThRkRkUL5/hFoTZnNRZTeULplRq2xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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