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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fcbe913d0e753e47f3bb9f453efc79d564efe4309edd53e9e7ab7850130350' 
  AND token = '52ABBY7eDsN/GowqYOzjHtLB6MXwhi7b/0K56SEsZMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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