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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f7c1c89f8e4fb323aef2d9517a1d8deea1544e5f5af72c81c6da6abe5bf74a' 
  AND token = 'yZNbsvQ4WHZb2qJWWpI4hlpXyavxpFOX6s/v+a8pV5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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