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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34e672a6151e62e70bdc7b9e280de28b0a716b16bc272db78538a95329a7d9d' 
  AND token = 'mQbUyYaSdib/KFu79O/vYl1cXkFCGiHY//3tSzCxSg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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