SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747f83869beb2425f5d2324f5e1022d8277654a8ec9c9e1dfbeb52094524ceb3' 
  AND token = 'uxQONmQmGZpsL/MUX/hcyiUJkoS7eKBF/RHk8CCb9aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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