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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c67883a9e92fa4f1fdb5907422e64360681f5d4970a55c6591f3dd8dba37398' 
  AND token = 'Dv18y0lUV1qIYTxWFWPvxWwYU5t4bXNSzoViHjH776s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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