SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cad78f5b2021458b9195b54726562e482dd9696441408ca57e7896f5b9a4030' 
  AND token = 'w+uLkLhdSomawUJCzSgVrxjTjuIbjk1PsJP+0uJ9lZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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