SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11925ef8c0a84ba8aeded0974b4e9226ac95ec9b42130d6dd2df3e0e53517c95' 
  AND token = 'EIGVweSp+mbwZpzpsOViPFeOrvCBLP2+8QauXPlNtRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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