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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a8ffb28a2d717f5a1768051af9e5df95fe15a8312da368e8b8afde8adebb62' 
  AND token = 'aYMNkVUebxdAfS9PrPy1EaA6Q0ajjGw3XvEkk7oLlcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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