SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e9f2bb395844621ba89808f13ae6f14390db678c799d6e35bdf201e4a301a5' 
  AND token = 'IlvO/HcbTdCBV38/+b1DrtBnhu3GVqslmKzlD2XZh3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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