SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6a2af56013482681dc9fe467fa1b21b90c6628448872cac13b840e2028d24a' 
  AND token = '0/YWxPAhTbcBIxBypD8/Wl4wFqBCvoAXvEJLzJ4qfbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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