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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2367d6f3512b8d05a3feedd4da2a3fceb82913c9c5cc0da18c404eea5d5f2dff' 
  AND token = 'DJk4dHcx6K0xVMV8WsPusulIfVWwsODGM/E34qFr17U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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