SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff757d1d2e15df5b8053e3c709d779bf29aab46d0719fb06a6b42a730bb388e5' 
  AND token = 'BYRYxZ+DrUR0YauUMewVkDTc8VtCF0jnHowu9uvzx+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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