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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2822804d9debe2008e3c965cc7a7d35d90fa0803c80f24d2eb49b4138b9a9852' 
  AND token = 'wlBUjAfZQo6smxDGFTN04/77TnCGdM69+I1OThELP24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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