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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec72da5a462aa380a6c8e5705fd6668d348b8b31e5a55ced3ad3e7de9032157f' 
  AND token = '760hmWwFZ8uLj80MS/CaX39dnT54M8jPa/UIm3nsD/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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