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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3133b52823f9448b86a0806ddf80c74d5fe49bff48d9ddc5cf745d55e61d35a6' 
  AND token = 'EqJAokjupP/sUaFBP5euzcc/EJqgrs9BLaG0JgE5AA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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