SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cd45aaaa2e109f8eccd7b7970689e64032a150c81ec208e65b2ff51241b977' 
  AND token = 'haY8RjvWJzeb/rAaV99FDRXwXX+1VgWlawTtCTq4ZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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