SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5800492188f3dd52e7f8c454e4f26acbcf931da1cd2476baf13209b1bbbff65c' 
  AND token = 'AvgGFQlAg0QuSqayVtJiKCulVFZyEcqxqgN+sAtVArc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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