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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924c9742fa0215fc9fee33eec604deb443e0deaaff661dab921035914b49a3ae' 
  AND token = '90KzqNBKE2W9U5Ot5OgNqtjf1cjqnRlI7jf6bi3lSrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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