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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ea745114aebd2e1df32824383dbf0260acdc143a8fee75acc733e02fea95cc' 
  AND token = 'SANp9zrUBjd6XWOF5kimCoX2lrOXkcqQABwfZYB5h8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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