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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4ae7cd7506afc45c86f36926cd4c12d7acda7473d71c72d710e311f8cf6fa6' 
  AND token = 'c1JR7RX9Kuica7VxCC9tZjm4ZYL4Npur9atZIoRIaIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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