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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a80aa6eac60d48e1a8cd91154f203bc19ab41ca8574f0abc3e298da7932292' 
  AND token = 'tg4o7oYrK82aWbvk8oFj1IzmNhZ9zqUINh3FlizuPzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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