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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc08afebed3163524f2a974793da0fb90c7aface02ad8907bcc0177eaf37efc5' 
  AND token = '/ppN6lOpX1eo3IFH8I4XqAvG3hxexNJVl/O2PGNzM8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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