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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82fd6a321e2ccfe62437db3f106ce07c8abc650c4d253fa558d17c48a09e73e' 
  AND token = 'K++JZ7cef7myW24roXIo64oA5wMKHmeVV11fEle0ErA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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