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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b3be6cc56ff888139953b77bac2463d8b527e58e10d8d529241e2c5b021abf' 
  AND token = '3sOh0JSIoGNmyz8BALdxaL8klq9BGW5eeEGDM5BG+As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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