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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa1359bae9dd4e348e1341b07895696d1b1348248fa70f45a0e8025181df32d' 
  AND token = '2mgy1m3S08FoPRUw63xYNjnN+AukVvybc1ES98cduqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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