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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b832ac4965ea665b3d5fe3f55ce9cb6bfc078c5cbee1dd9c4c7567bc86ec3be8' 
  AND token = 'U1UrcTfOWMW3dlSfW3DDwJFjJzIQLt0dZSvsJx6Q6zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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