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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb1a47ed70233ae8f9b11debad64d1504a10cf4f6976f28de85782a89220d93' 
  AND token = '3N9IShgIhkKRoNAabmxyVtVyTdb/LKmcPZD5D1311T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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