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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba407fa7d1bbf9181bf8eb2ede299bc51ff469b1b665ea6bea0cc0e4f79551c' 
  AND token = 'TIyTIwCCcxxtB8nOtu5hH617C52Uf54vVd5PTZU4WZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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