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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b635693ec6b0355f49ce18caeba715c1c9c32c34742fcc0969e6395625ab43' 
  AND token = 'HZPcEZ4+OU8XjenwY2LL/KgK4fcqd9HWZbrp5rZIvDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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