SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987f1da0a903b25ce9fb66790f60e7f2505a4c372d17a7fd4889bcd9f48b1c4d' 
  AND token = 'zMA5uK98tmXCe5+wIcNIW+sG5LNGzpPYWQhZtFhLstM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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