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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15429c1b903e9e2242082dd19e80d1a378d96fbf6acf29701866da60b6831d01' 
  AND token = 'UTclp3Rg6VWbestER3IwjJkZ9UtBjGXU3B0ZmIPzBKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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