SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3200bc8457449775e2131b365cdf2f4554cd5079968aee602de7bb9a105c0ace' 
  AND token = 'okEGXAvB0arX6/0fUDafVjnT12zHVPqfZP/UEQ+stpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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