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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2827c7de7e67d924c6cda2801e7056c781bea20bc33b2b0537bd29d5a5255a' 
  AND token = 'aHtdHmqhJCETJmhbS5fVrO1QqLyJsGqz3PSTeJA138Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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