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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949dc8422a8f8cace4d1a2148f383cc9a79d5164f488b498a6417a039ff672e5' 
  AND token = 'JuKCbt9jfvRluaUNqo/FFxidP/qaMm0XQS8D7FgzJuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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