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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9850941d76e4756d8acb917f16674fdf5e175df6da618bf61e013ba41f56d9' 
  AND token = 'ZHFZ7wI4AClbBl8yK37xiup6afg2xh0W+E64E+TcG/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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