SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003924527eb9029cfa24bf7db9cd04f6664cf88f5be5a9a5b351b68dfd766bf9' 
  AND token = 'I6I+MHantPPOJBOV+rc+2NJ2KodO8xpUjcVmpzElP/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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