SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45c52167f88ab8e4dc5fcfbad2090b0615c523cb93b7cd73b9726a6d4c3fad0' 
  AND token = '6J2k6MVZrLuws+o5V//9cYUCfxO4wZ6GmAKEgN1XR28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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