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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4c64d6db8af94b28e1ffd127acaa759cde38632976992c9ca90f2fd5a4e99e' 
  AND token = 'qszXaW/LKI/SsvNzTiciIvxP9fFL293gS/nwx4EwmOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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