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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a0834c228830a8ec87ac7f4c51674623ba5795406cbe94a1726df10ab441bc' 
  AND token = 'buxuu2wwURDjXiBkcJMS+ykFJtyuZJYCSpZs2G6cSs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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