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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce58688088590291956c4dada5bfb9905da55838cdd7161d488d413cd07c40c9' 
  AND token = '4Z/FnVJ4Mn0xY2nvpsDp0LGnD09zvzUlhl5Hlo462HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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