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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4df09c0f77e85231147b461d6c957a70c04f2407aab7c22596ad0e5cd4bcb2' 
  AND token = '2HzLZhNu8LXU4WvOeY75MTM8eBjT5eJx9jU+j5Wpp1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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