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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abd299eb84ec508c29c0a71fa1491a18c7964fe6e2569c468c34b8639124b7e' 
  AND token = 'zbnHpxfVqAE0lpmFV3KA6nOsx38XLSE7kShdRbVNnhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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