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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14a4ba7b071b72e48e04810f981766536fde7c6f846aa0068fb48992031ed1a' 
  AND token = 'wuSyD1uzjB4TcvZCOdeP97D+Bo5PxgVvjkptGiGGyBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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