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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2dc3ec8e7ed551c7d12de239d2bfac634627a390bbf35d62e00817f301cae8' 
  AND token = 'HzQHjcVZaupIslOQP7UVLezey2Yz0R5A05cUsE3543o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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