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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1882a7805708b575979d2d1075135ede4fb1395a328846a9dd405aab70e8a92a' 
  AND token = 'vM2Ft0IkAbU3XI8Rce3Q+siYb4Yl34sLmr+YmPe+Z2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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