Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebdbce51c4ee751a92a664379e08873511dd4ac7eb214e2ebf5046e9c1e41fd' 
  AND token = 'ChvTiTs+WrJk47gQqPAOXiRx1Fs6a/AMTHnp6U6Coew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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