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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0307d71f1de2021e9b81e222b05e03e306e30232215d8531ae49fe870943c31' 
  AND token = 'kNQd5Qd55HhnTpAAALxTarmgnZvviIN8TpnWiOu0VnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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