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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c036ac42d95304497b66977a2a921be13b99513474fe9bf54aab376216c19e' 
  AND token = 'J/jveEstUASdWhwFAXvrwxG2VXScLrHfP5D9Eg1NWas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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