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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4ec520287f52a0be1349acb69dc44081d5d4d94177c6365497e0bfa965477f' 
  AND token = 'sHDQTiwA5fc01uq0cE0VHuAY2hPDawDyGvIUwvf7apE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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