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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f590e4dcb16561bb5908c19c6354ae5fdb5ce8f9758a76c051c6aaf09200df1' 
  AND token = 'pJBhK8WTVQdDnP/mTa8BWnJyJdoPCZXPcKCjAJU4sHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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