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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1813520ae05371c1301c95dc319cd1f589be48bac0f742a4476209624d3c5342' 
  AND token = 'OeeO9mLzckim20Zv2yKSMLh+eGvlBxKAMZacxpzUboQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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