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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2ce93c075d8559bff3979f304542e4ff271eb1ce82e67806cc86ae2697c93d' 
  AND token = 'C51iUxHUTKBHYH9b1PSEcdFveiowsmyXqPltbbnu7BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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