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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfac466a21f194b6e6bb45250fe70f4cd2fa960cf659f575717834de0097970d' 
  AND token = 'zR+mf795bNyNlQ+KNKTRA+wyEsOvC6os6e+Mi3bI2qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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