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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb00d7241f789e3c86ed70f5baf61159536acc3a8f24b4399916d4e9054653f' 
  AND token = 'tMMCSeTbRJ1jcsUfUSbu2ZbB5Dgfx3Btl1OUXZ4S1Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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