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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162b1fd9de7d051d90654a21b622f663ed0f8c3340b0aa7c98501f1a9d57e0ae' 
  AND token = 'X3HUpnp55otynlnxbNgVg6UEh01X+4/keu4EYM9vf9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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