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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49377db0d005046a34a0498ad73c938732c839da62c3fb9641604203def674e0' 
  AND token = 'bhorfexDPlEus887KKcj/fO/S7s6TOSkInRICY9AfkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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