SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa9cf87f80b3e4d9df399487015481f6946199ab59177902ae03c061db39659' 
  AND token = 'JTfta/HtpuxrwEwZDWnVyDQHA+8wZhB+i2174X7xvvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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