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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd6f904ed3dbecc2145b987ca578cfce0710f2193dc45b2e42b7bc4d659a3e4' 
  AND token = 'HwGGIOf0/5XLNFY0qUOs9g7233McsUhTAyq67hrwG10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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