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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef24f6c3e21481aa190c3b7e7a677407f5afcf88014ee3cca6aec29d6209c44' 
  AND token = 'uGRgvcyska4fpyF127UkH+HxjCD+MELSt/jFFclD4l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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