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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668316bb756f441d58db4a5a8fd9c79456a17c6caaca537e5e0ae121e44150a9' 
  AND token = 'qXPFzMMI72ivCUEdLS13zUSsAaXDEu9N5zoeC9cLODY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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