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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700ef6e1d34bdad6f4f12ad5ce33cab987a2bfab9569503bfb54def19d4443bf' 
  AND token = 'qaQsx+xEFzlAzXono5379eIbCrJY/YpY1xSxhW/JbsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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