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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c777d9b3416011b70fbc338b26a8f13d1cdec82fa937ee6c47daaba0f75b49c2' 
  AND token = 'mHEzwVu3sZd0JrfBeK9W2y6NkEzP6KF9ukMwcjElM/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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