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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56808a2f033da9098c632aaa0d62efc06326d8ac9ec0d037e740b4da7c1f157f' 
  AND token = 'O0Amgny3foPKBC1XfJsau3pUL78AquWqgTxC8TDKzT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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