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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d28a5a3acab87d459ccc5b7dae0efa79ba08e3f8c7da60fb8b948fc5ee1362b' 
  AND token = '6I5AsBIx89+7eNg9MYmgfv+RaiYFscfIuULy4cHt+x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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