SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21308d11c786d94d914bd0eff69d7ee7e40a65327e69686cd1665ed49480ebcf' 
  AND token = '9LlliFC+p5v5niKGUpjxn8kUEIMNiGrTJfuo6wAQ+JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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