SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995696bd9ddae48ff686d1aba9706b61578e38cfa6b133ccbcf4fde2a84e9ec1' 
  AND token = '12hKAjWeGgVrz6EH/rRZTbZrq3poZ3w+nuuXk9XROQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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