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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177c297a4b6ce95d668886f8a680b78e4e5135ff64b96ef3f7073af71fa78c13' 
  AND token = 'McnRJ5fclcOSqY+ZNDIEvh73FhuvVjNn6hRDdNJhkjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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