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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceead97f9e3ea10053a73f7f80344a331e6f2430315f0fc7a6e21f0f95065bef' 
  AND token = 'iN4dVU3eHUhJHusk3UvbhJYtnNsFWQJo1FaZABJEOsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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